Legal claims defining the scope of protection, as filed with the USPTO.
1. An information transmission apparatus for converting a format of input information into a predetermined format prior to transmission of said input information, said information transmission apparatus, comprising: first conversion means for converting a first information-bit sequence having a predetermined number of bits into a first encoded sequence having M numbers; first multiplication means for multiplying said first encoded sequence produced by said first conversion means by a first constant; second conversion means for converting a second information-bit sequence having a predetermined number of bits into a second encoded sequence having M numbers; second multiplication means for multiplying said second encoded sequence produced by said second conversion means by a second constant; wherein the first and second constants are based on a transmission energy for achieving a desired bit error rate; addition means for adding a constituent of a first constant-times encoded sequence produced by said first multiplication means to a constituent of a second constant-times encoded sequence produced by said second multiplication means to produce an additive encoded sequence; and transmission means for transmitting said additive encoded sequence as a transmitted signal.
2. The information transmission apparatus according to claim 1 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, said first multiplication means multiplies said first encoded sequence by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of said noise and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added, said second multiplication means multiplies said second encoded sequence by said second constant so as to reduce a bit error rate for said second information-bit sequence.
3. The information transmission apparatus according to claim 1 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, said first multiplication means multiplies said first encoded sequence by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of a noise greater than said noise by a predetermined amount and a sequence having the a statistical characteristic as said first constant-times encoded sequence is added, said second multiplication means multiplies said second encoded sequence by said second constant so as to reduce a bit error rate for said second information-bit sequence.
4. The information transmission apparatus according to claim 1 , wherein: said first conversion means comprises: first encoding means for carrying out an encoding operation on said first information-bit sequence; and first modulation means for carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said first encoding means to produce said first encoded sequence comprising N numbers, wherein said second conversion means comprises: second encoding means for carrying out an encoding operation on said second information-bit sequence; and second modulation means for carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said second encoding means to produce said second encoded sequence comprising M numbers.
5. The information transmission apparatus according to claim 4 , wherein one of said first encoding means and said second encoding means carry out a parallel concatenated convolutional coding operation.
6. The information transmission apparatus according to claim 4 , wherein: one of said first encoding means and said second encoding means has channel interleave means for rearranging an order of pieces of data of the input information based on predetermined information on permutation locations; and one of said first modulation means and said second modulation means carries out a mapping operation of signal points by adoption of a predetermined modulation technique on interleaved data generated by said channel interleave means.
7. The information transmission apparatus according to claim 4 , wherein one of said first modulation means and said second modulation means carries out a mapping operation of signal points by adoption of a 2-phase modulation technique.
8. The information transmission apparatus according to claim 1 , wherein: said first multiplication means multiplies said first encoded sequence by said first constant; said second multiplication means multiplies said second encoded sequence by said second constant; said first constant and said second constant are determined based on a state of a communication line; and said state of a communication line is discriminated by an information reception apparatus receiving said additive encoded sequence.
9. The information transmission apparatus according to claim 1 , further comprising discrimination means for discriminating a state of a communication line being used for reception, wherein said first multiplication means multiplies said first encoded sequence by said first constant; said second multiplication means multiplies said second encoded sequence by said second constant; said first constant and said second constant are determined based on the state of said communication line being used for reception; and said state of the communication line is discriminated by said discrimination means.
10. The information transmission apparatus according to claim 9 , further comprising multiplexing means for multiplexing said determined first constant and said determined second constant in a highest-order second information-bit sequence subjected to an addition operation last in said addition means, wherein said second conversion means converts data produced by said multiplexing means as a result of multiplexing into said second encoded sequence comprising M numbers.
11. The information transmission apparatus according to claim 1 , wherein said first information-bit sequence and said second information-bit sequence are one of pieces of information, which are independent of each other, and results of an operation to split an information-bit sequence.
12. The information transmission apparatus according to claim 1 , wherein said first information-bit sequence has a bit count equal to a bit count of said second information-bit sequence.
13. An information transmission method for converting a format of input information into a predetermined format prior to transmission of said input information, comprising: a first conversion process of converting a first information-bit sequence having a predetermined number of bits into a first encoded sequence comprising M numbers; a first multiplication process of multiplying said first encoded sequence produced by said first information-bit sequence by a first constant; a second conversion process of converting a second information-bit sequence having a predetermined number of bits into a second encoded sequence having M numbers; a second multiplication process of multiplying said second encoded sequence produced by said second information-bit sequence by a second constant; wherein the first and second constants are based on a transmission energy for achieving a desired bit error rate; an addition process of adding a constituent of a first constant-times encoded sequence produced by said first multiplication process to a constituent of a second constant-times encoded sequence produced by said second multiplication process to produce an additive encoded sequence; and a transmission process of transmitting said additive encoded sequence as a transmitted signal.
14. The information transmission method according to claim 13 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of said noise and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added, in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant so as to reduce a bit error rate for said second information-bit sequence.
15. The information transmission method according to claim 13 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of a noise greater in magnitude than said noise by a predetermined amount and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant so as to reduce a bit error rate for said second information-bit sequence.
16. The information transmission method according to claim 13 , wherein: said first conversion process of converting said first information-bit sequence comprises: a first encoding process of carrying out a predetermined encoding operation on said first information-bit sequence; and a first mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said first encoding process to produce said first encoded sequence comprising M numbers, wherein said second conversion process of converting said second information-bit sequence comprises: a second encoding process of carrying out a predetermined encoding operation on said second information-bit sequence; and a second mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said second encoding process to produce said second encoded sequence comprising M numbers.
17. The information transmission method according to claim 16 , wherein one of said first encoding process of carrying out a predetermined encoding operation on said first information-bit sequence and said second encoding process of carrying out a predetermined encoding operation on said second information-bit sequence includes performing a parallel concatenated convolutional coding process.
18. The information transmission method according to claim 16 , wherein: one of said first encoding process of carrying out a predetermined encoding operation on said first information-bit sequence and said second encoding process of carrying out a predetermined encoding operation on said second information-bit sequence includes a channel interleave process of rearranging an order of pieces of input data on the basis of predetermined information on permutation locations to produce interleaved data; and one of said first mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said first encoding process of carrying out a predetermined encoding operation on said first information-bit sequence and said second mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said second encoding process of carrying out a predetermined encoding operation on said second information-bit sequence includes a mapping process of signal points, which is performed on said interleaved data generated by said channel interleave process on the basis of a predetermined modulation technique.
19. The information transmission method according to claim 16 , wherein one of said first mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said first encoding process of carrying out a predetermined encoding operation on said first information-bit sequence and said second mapping process of carrying out a mapping operation of signal points by adoption of a predetermined modulation technique on a sequence generated by said second encoding process of carrying out a predetermined encoding operation on said second information-bit sequence includes a mapping process of signal points based on a 2-phase modulation technique.
20. The information transmission method according to claim 13 , wherein: in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant; in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant; said first constant and said second constant are determined based on a state of a communication line; and said state of a communication line is discriminated by an information reception apparatus receiving said additive encoded sequence.
21. The information transmission method according to claim 13 , further comprising a discrimination process of discriminating a state of a communication line being used for reception, wherein in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant; in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant; said first constant and said second constant are determined based on a state of said communication line being used for reception; and said state of said communication line being used for reception is discriminated in said discrimination process.
22. The information transmission method according to claim 21 , further comprising a multiplexing process of multiplexing said first constant and said second constant in a highest-order second information-bit sequence subjected to an addition operation last in said addition process; and in said second conversion process of converting said second information-bit sequence, data produced as a result of multiplexing in said multiplexing process of multiplexing data into said highest degree second information-bit sequence is converted into said second encoded sequence comprising M numbers.
23. The information transmission method according to claim 13 , wherein said first information-bit sequence and said second information-bit sequence are one of pieces of information, which are independent of each other and results of an operation to split an information-bit sequence.
24. The information transmission method according to claim 13 , wherein said first information-bit sequence has a bit count equal to a bit count of said second information-bit sequence.
25. The information reception apparatus for receiving a reception signal comprising an additive encoded sequence and a predetermined noise added to said additive encoded sequence transmitted by an information transmission apparatus, comprising: first conversion means for converting a first information-bit sequence having a predetermined number of bits into a first encoded sequence comprising N numbers; first multiplication means for multiplying said first encoded sequence produced by said first conversion means by a first constant; second conversion means for converting a second information-bit sequence having a predetermined number of bits into a second encoded sequence comprising M numbers; second multiplication means for multiplying said second encoded sequence produce by said second conversion means by a second constant; wherein the first and second constants are based on a transmission energy for achieving a desired bit error rate; addition means for adding the constituent of a first constant-times encoded sequence produced by said first multiplication means as a result of multiplication to the constituent of a second constant-times encoded sequence produced by said second multiplication means to produce said additive encoded sequence; and transmission means for transmitting said additive encoded sequence as said transmitted signal, said information reception apparatus including: reception means for receiving said reception signal; and decoding means for carrying out a decoding operation to produce at least one of said first information-bit sequence and said second information-bit sequence based on a received value received from said reception means.
26. The information reception apparatus according to claim 25 , wherein, based on said received value supplied by said reception means, said decoding means carries out a decoding operation to produce a highest-order second information-bit sequence subjected to an addition operation last in said addition means.
27. The information reception apparatus according to claim 25 , wherein said decoding means has a first decoding means for carrying out a decoding operation as a counterpart operation of said first conversion means and second decoding means for carrying out a decoding operation as a counterpart operation of said second conversion means.
28. The information reception apparatus according to claim 27 , wherein: said first decoding means carries out a decoding operation to produce said first information-bit sequence based on information on encoded sequences other than said first encoded sequence and based on said received value; and said second decoding means carries out a decoding operation to produce said second information-bit sequence based on information on encoded sequences other than said second encoded sequence and on the basis of said received value.
29. The information reception apparatus according to claim 28 , wherein: said second decoding means carries out a decoding operation to produce said second information-bit sequence based on information on said first encoded sequence and based on said received value; and said first decoding means carries out a decoding operation to produce said first information-bit sequence based on information on said second encoded sequence obtained as a result of said decoding operation carried out by said second decoding means and based on said received value.
30. The information reception apparatus according to claim 27 , wherein said first and second decoding means each have likelihood computation means for computing a likelihood regarding a reception symbol from said received value.
31. The information reception apparatus according to claim 30 , wherein: based on priori probability information for an encoded sequence other than said first encoded sequence and based on said received value, said first decoding means finds posteriori probability information for said first information-bit sequence and outputs said posteriori probability information for said first encoded sequence; and based on priori probability information for an encoded sequence other than said second encoded sequence and based on said received value, said second decoding means finds posteriori probability information for said second information-bit sequence and outputs said posteriori probability information for said second information-bit sequence as a result of said decoding operation and finds posteriori probability information for said second encoded sequence and outputs said posteriori probability information for said second encoded sequence.
32. The information reception apparatus according to claim 31 , wherein: based on priori probability information for said first encoded sequence and based on said received value, said second decoding means finds posteriori probability information for said second information-bit sequence ad outputs said posteriori probability information for said second information-bit sequence as a result of said decoding operation and finds posteriori probability information for said second encoded sequence and outputs said posteriori probability information for said second encoded sequence to said first decoding means as priori probability information for said second encoded sequence; and based on the priori probability information received from said second decoding means for said second encoded sequence and based on said received value, said first decoding means finds posteriori probability information for said first information-bit sequence and outputs said posteriori probability information for said first information-bit sequence as a result of said decoding operation and finds posteriori probability information for said first encoded sequence and outputs said posteriori probability information for said first encoded sequence to said second decoding means as priori probability information for said first encoded sequence.
33. The information reception apparatus according to claim 25 , wherein said decoding means carries out of a MAP decoding operation and a decoding operation conforming to said MAP decoding operation.
34. The information reception apparatus according to claim 25 , wherein said decoding means carries out decoding operations to generate information-bit sequences sequentially starting with a highest-order second information-bit sequence subjected to an addition operation last in said addition means.
35. The information reception apparatus according to claim 25 , wherein said decoding means carries out one of a zigzag and repetitive decoding operation.
36. The information reception apparatus according to claim 25 , wherein: said decoding means has a likelihood computation means for computing a likelihood regarding a reception symbol from said received value; and when at least one of said first encoded sequence and said second encoded sequence has been encoded, said likelihood computation means selects a constituent that maximizes posteriori probability information for any constituent as a best candidate, and uses said best candidate as priori probability information for an encoded sequence to find a likelihood for another encoded sequence.
37. The information reception apparatus according to claim 25 , wherein: said decoding means has a likelihood computation means for computing a likelihood regarding a reception symbol from said received value; and when at least one of said first encoded sequence and said second encoded sequence has been encoded, said likelihood computation means finds an expected value for any arbitrary constituent already subjected to a soft decision as posteriori probability information and uses said posteriori probability information as priori probability information for an encoded sequence to find a likelihood for another encoded sequence.
38. The information reception apparatus according to claim 25 , wherein: said decoding means has a likelihood computation means for computing a likelihood regarding a reception symbol from said received value; and when an encoded sequence not decoded yet is found to exist in an attempt to decode on of said first encoded sequence and said second encoded sequence, said likelihood computation means finds a likelihood for an encoded sequence by regarding said encoded sequence not decoded yet as a Gaussian noise having an equal electric power.
39. The information reception apparatus according to claim 25 , further comprising: re-encoding means for re-encoding a highest-order second information-bit sequence by using posteriori probability information for said second information-bit sequence upon completion of a decoding operation carried out by said decoding means to produce said highest-order second information-bit sequence subjected last to an addition operation carried out by said addition means; correlation computation means for finding a correlation between a hard-decision value sequence is an estimated value of said second encoded sequence obtained as a result of a re-encoding operation carried out by said re-encoding means; and channel estimation means for estimating an amplitude of a communication line by using a correlation value found by said correlation computation means.
40. The information reception apparatus according to claim 25 , further comprising: re-encoding means for re-encoding a highest-order second information-bit sequence by using a posteriori probability information for said second encoded sequence upon completion of a decoding operation carried out by said decoding means to produce said highest-order second information-bit sequence subjected last to an addition operation carried out by said addition means; correlation computation means for finding a correlation between a hard-decision value sequence and said received value where said a hard-decision value sequence is an estimated value of said second encoded sequence obtained as a result of a re-encoding operation carried out by said re-encoding means; and channel estimation means for estimating an amplitude of a communication line by using a correlation value found by said correlation computation means.
41. The information reception apparatus according to claim 25 , further comprising discrimination means for discriminating a state of a communication line; and said first and second constants are determined based on the state of said communication line discriminated by said discrimination means.
42. The information reception apparatus according to claim 25 , wherein said reception means receives said first and second constants determined based on a state of a communication line discriminated by said transmission apparatus.
43. The information transmission apparatus according to claim 42 , wherein: said first and second constants determined by said information transmission apparatus are multiplexed in a highest-order second information-bit sequence subjected last to an addition operation carried out by said addition means; and further comprising separation means for separating said first and second constants from said second information-bit sequence.
44. The information reception apparatus according to claim 25 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, said first multiplication means multiplies said first encoded sequence by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of said noise and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added, said second multiplication means multiplies said second encoded sequence by said second constant so as to reduce a bit error rate for said second information-bit sequence.
45. The information reception apparatus according to claim 25 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, said first multiplication means multiplies said first encoded sequence by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of noise greater than said noise by a predetermined amount and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added, said second multiplication means multiplies said second encoded sequence by said second constant so as to reduce a bit error rate for said second information-bit sequence.
46. An information reception method for receiving a reception signal having an additive encoded sequence and a predetermined noise added to said additive encoded sequence transmitted in accordance with a transmission method, comprising: a first conversion process of converting a first information-bit sequence comprising a predetermined number of bits into a first encoded sequence having an M-dimensional real number vector; a first multiplication process of multiplying said first encoded sequence produced by said first conversion process as a result of conversion by a first constant; a second conversion process of converting a second information-bit sequence having a predetermined number of bits into a second encoded sequence having an M-dimensional real number vector; a second multiplication process of multiplying said second encoded sequence produced by said second conversion process as a result of conversion by a second constant; wherein the first and second constants are based on a transmission energy for achieving a desired bit error rate; an addition process of adding a constituent of a first constant-times encoded sequence produced by said first multiplication process as a result of multiplication to a constituent of a second constant-times encoded sequence produced by said second multiplication process as a result of multiplication to produce an additive encoded sequence; and a transmission process of transmitting said additive encoded sequence as said transmitted signal, said information reception method, comprising: a reception process of receiving said reception signal; and a decoding process of carrying out a decoding operation to produce at least one of said first information-bit sequence and said second information-bit sequence based on the received value received from said reception process.
47. The information reception method according to claim 46 , wherein, based on said received value supplied by said reception process, in said decoding process of carrying out a decoding operation to produce at least a information-bit sequence, a decoding operation is carried out to produce said highest-order second information-bit sequence subjected to an addition operation last in said addition process of producing said additive encoded sequence.
48. The information reception method according to claim 46 , wherein said decoding process of carrying out a decoding operation to produce at least an information-bit sequence includes a first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence and a second decoding process of carrying out a decoding operation as a counterpart of said second conversion process of converting said second information-bit sequence.
49. The information reception method according to claim 48 , wherein: in said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence, a decoding operation is performed to produce said first information-bit sequence based on encoded sequences other than said first encoded sequence and based on said received value; and in said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence, a decoding operation is performed to produce said second information-bit sequence based on encoded sequences other than said second encoded sequence and based on said received value.
50. The information reception method according to claim 49 , wherein: in said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence, a decoding operation is performed to produce said second information-bit sequence based on information on said first encoded sequence and based on said received value; and in said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence, a decoding operation is performed to produce said first information-bit sequence based on information on said second encoded sequence obtained as a result of said decoding operation carried out by said second decoding process and based on said received value.
51. The information reception method according to claim 48 , wherein said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence and said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence each include a likelihood computation process of computing a likelihood regarding a reception symbol from said received value.
52. The information reception method according to claim 51 , wherein: based on priori probability information for an encoded sequence other than said first encoded sequence and based on said received value, in said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence, posteriori probability information for said first information-bit sequence is found and output as a result of said decoding operation, and posteriori probability information for said first encoded sequence is found and output; and based on priori probability information for an encoded sequence other than said second encoded sequence and based on said received value, in said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence, posteriori probability information for said second information-bit sequence is found and output as a result of said decoding operation, and posteriori probability information for said second encoded sequence is found and output.
53. The information reception method according to claim 52 , wherein: based on priori probability information for said first encoded sequence and based on said received value, in said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence, posteriori probability information for said second information-bit sequence is found and output as a result of said decoding operation, and posteriori probability information for said second encoded sequence is found and output as prior probability information for said second encoded sequence to said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence; and based on priori probability information for said second encoded sequence received from said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence and based on said received value, in said first decoding process of carrying out a decoding operation as a counterpart operation of said first conversion process of converting said first information-bit sequence, posteriori probability information for said first information-bit sequence is found and output as a result of said decoding operation, and posteriori probability information for said first encoded sequence is found and output as priori probability information for said first encoded sequence to said second decoding process of carrying out a decoding operation as a counterpart operation of said second conversion process of converting said second information-bit sequence.
54. The information reception method according to claim 46 , wherein, in said decoding process of carrying out a decoding operation to produce at least an information-bit sequence, one of a MAP decoding operation a decoding operation conforming to said MAP decoding operation is performed.
55. The information reception method according to claim 46 , wherein, in said decoding process of carrying out a decoding operation to produce at least a information-bit sequence, decoding operations are preformed to generate information-bit sequences sequentially starting with a highest-order second information-bit sequence subjected to an addition operation last in said addition process of producing said additive encoded sequence.
56. The information reception method according to claim 46 , wherein said decoding process of carrying out a decoding operation to produce at least a information-bit sequence, one of a zigzag and a repetitive decoding operation is performed.
57. The information reception method according to claim 46 , wherein: said decoding process of carrying out a decoding operation to produce at least a information-bit sequence has a likelihood computation process of computing a likelihood regarding a reception symbol from said received value; and when at least one of said first encoded sequence and said second encoded sequence has been encoded, in said likelihood computation process, a constituent that maximizes posteriori probability information for any constituent is selected as a best candidate to be used as priori probability information for an encoded sequence in an operation to find a likelihood for another encoded sequence.
58. The information reception method according to claim 46 , wherein: said decoding process of carrying out a decoding operation to produce at least an information-bit sequence has a likelihood computation process of computing a likelihood regarding a reception symbol from said received value; and when at least one of said first encoded sequence and said second encoded sequence has been encoded, in said likelihood computation process, an expected value for any arbitrary constituent already subjected to a soft decision is found as posteriori probability information to be used as priori probability information for an encoded sequence in an operation to find a likelihood for another encoded sequence.
59. The information reception method according to claim 46 , wherein: said decoding process of carrying out a decoding operation to produce at least an information-bit sequence has a likelihood computation process of computing a likelihood regarding a reception symbol from said received value; and when at least one of said first encoded sequence and said second encoded sequence has been encoded, in said likelihood computation process, an expected value for any arbitrary constituent already subjected to a soft decision is found as posteriori probability information to be used as priori probability information for an encoded sequence in an operation to find a likelihood for another encoded sequence.
60. The information reception method according to claim 46 , further comprising: a re-encoding process carried out for re-encoding a highest-order second information-bit sequence by using posteriori probability information for said second information-bit sequence upon completion of a decoding operation performed in said decoding process of carrying out a decoding operation to produce at least an information-bit sequence, that is, upon completion of a decoding operation to generate said highest-order second information-bit sequence subjected last to an addition operation carried out in said addition process of producing said additive encoded sequence; a correlation computation process of finding a correlation between a hard-decision value sequence and said received value where said hard-decision value sequence is an estimated value of said second encoded value obtained as a result of a re-encoding operation carried out in said re-encoding process of carrying out a re-encoding operation; and a channel estimation process of estimating an amplitude of a communication line by using a correlation value found in said correlation computation process of finding a correlation between a hard-decision value sequence and said received value.
61. The information reception method according to claim 46 , further comprising: a re-encoding process carried out for re-encoding a highest-order second information-bit sequence by using posteriori probability information for said second encoded sequence upon completion of a decoding operation performed in said decoding process of carrying out a decoding operation to produce at least an information-bit sequence, that is, upon completion of a decoding operation to generate said highest-order second information-bit sequence subjected last to an addition operation carried out in said addition process of producing said additive encoded sequence; a correlation computation process of finding a correlation between a hard-decision value sequence and said received value where said hard-decision value sequence is an estimated value of said second encoded value obtained as a result of a re-encoding operation carried out in said re-encoding process of carrying out a re-encoding operation; and a channel estimation process of estimating an amplitude of a communication line by using a correlation value found in said correlation computation process of finding a correlation between a hard-decision value sequence and said received value.
62. The information reception method according to claim 46 , further comprising a discrimination process of discriminating a state of a communication line, wherein said first and second constants are determined based on the state of said communication line discriminated in said discrimination process.
63. The information reception method according to claim 46 , wherein in said reception process of receiving said reception signal, said first and second constants determined in accordance with said information transmission method based on a state of a communication line discriminated in accordance with said information transmission method are received.
64. The information transmission method according to claim 63 , wherein: said determined first and second constants are multiplexed in a highest-order second information-bit sequence subjected last to an addition operation carried out in said addition process of producing said additive encoded sequence; and there is further provided a separation process of separating said first and second constants from said second information-bit sequence.
65. The information reception method according to claim 46 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of said noise and a sequence having a same statistical characteristic as said first constant-times encoded sequence is added, in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant so as to reduce a bit error rate for said second information-bit sequence.
66. The information reception method according to claim 46 , wherein: when said first encoded sequence is regarded as a sequence to be transmitted through a communication line along which noise is added, in said first multiplication process of multiplying said first encoded sequence by said first constant, said first encoded sequence is multiplied by said first constant so as to reduce a bit error rate for said first information-bit sequence; and when said second encoded sequence is regarded as a sequence to be transmitted through a communication line along which a sum of a noise greater in magnitude than said noise by a predetermined amount and a sequence having the same statistical characteristic as said first constant-times encoded sequence is added, in said second multiplication process of multiplying said second encoded sequence by said second constant, said second encoded sequence is multiplied by said second constant so as to reduce a bit error rate for said second information-bit sequence.
Unknown
June 5, 2007
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